Welcome to civil engineering fanatics. Today, we will discuss the design stress-strain curve of concrete and steel which is the basis for the design theory behind reinforced concrete structures. We know that most of the structures are designed based on the Limit state method (LSM). The design assumptions and related equations are based on this idealized stress-strain curve of concrete and steel which is as suggested by the Indian standard code IS:456-2000.
Before we move to the stress-strain analysis, let's have an overview of concrete and steel reinforcement.
We know that concrete is weak in tension and strong in compression. While steel is strong in tension, we incorporate it in concrete to impart tensile strength to concrete. Hence, we have reinforced concrete structure.
So in stress-strain analysis, concrete is tested in compression (Compression Test) and the steel is tested for tension (Tension Test). So the stress-strain curve of concrete is as per the compression test and that of steel is as per the tension test.
Now, let's study the stress-strain curve of concrete and steel in detail.

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